CN1044412C - Source voltage control circuit - Google Patents
Source voltage control circuit Download PDFInfo
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- CN1044412C CN1044412C CN90109627A CN90109627A CN1044412C CN 1044412 C CN1044412 C CN 1044412C CN 90109627 A CN90109627 A CN 90109627A CN 90109627 A CN90109627 A CN 90109627A CN 1044412 C CN1044412 C CN 1044412C
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- 238000001514 detection method Methods 0.000 claims description 19
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- 239000002800 charge carrier Substances 0.000 description 2
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- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/50—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
- H03F3/505—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower with field-effect devices
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/462—Regulating voltage or current wherein the variable actually regulated by the final control device is dc as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic
- G05F1/465—Internal voltage generators for integrated circuits, e.g. step down generators
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/24—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations wherein the transistors are of the field-effect type only
- G05F3/242—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations wherein the transistors are of the field-effect type only with compensation for device parameters, e.g. channel width modulation, threshold voltage, processing, or external variations, e.g. temperature, loading, supply voltage
- G05F3/247—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations wherein the transistors are of the field-effect type only with compensation for device parameters, e.g. channel width modulation, threshold voltage, processing, or external variations, e.g. temperature, loading, supply voltage producing a voltage or current as a predetermined function of the supply voltage
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Abstract
There is provided a source voltage control circuit including a reference voltage generating circuit with a negative feedback circuit, a source voltage level sensing circuit for increasing the internal source voltage when the external voltage exceeds a given voltage, a first differential amplifying circuit for active operation, and a second differential amplifying circuit for stand-by operation, whereby a stable internal source voltage is produced and the slope of the internal source voltage is readily adjusted when the external source voltage exceeds the given value. The first differential amplifying circuit receives the reference voltage and the internal source voltage, controlled by a first control signal and the output of the source voltage level sensing circuit. The second differential amplifying circuit receives the reference voltage and the internal source voltage, controlled by a second control signal.
Description
The present invention relates to a kind of source voltage control circuit that is used for semiconductor storage unit, particularly a kind of interior stable circuit of supply voltage of maintenance that has nothing to do with the external power change in voltage, and internal power source voltage is linear increase when outer power voltage is equal to or greater than a certain ratings.
Recently, semiconductor devices tends to that more and more the highland is integrated, therefore just makes the corresponding increase of the voltage that applies on it owing to dwindled the area of this device at its electrode size in the semiconductor devices of the sub-micron order of magnitude, so influenced the reliability of device greatly.
For example at the MOS of the semiconductor memory that is used for high integration in a large number (metal-oxide semiconductor (MOS)) transistor, though outer power voltage remains on such as on 5 volts the steady state value, channel length becomes and is short to less than 1 micron, thereby drain voltage increases.Therefore, punch-through appears in the there, and depletion layer extends to source electrode near drain electrode.It consequently is the serious harmful effect of work generation of little MOS transistor of the sub-micron order of magnitude to electrode size that this phenomenon increases the leakage current between source electrode and the drain electrode.
In addition, inner field intensity increases and increases according to appearing near the drain voltage on the depletion layer of drain electrode, thereby some charge carriers obtain additional-energy, so cause hot carrier's effect, this effect comprises: because charge carrier penetrates the threshold values variation that grid oxic horizon causes, the increase of the substrate current that ionizing collision causes, the degeneration of device, or the like.
For the reliability that prevents semiconductor equipment reduces owing to puncture and hot carrier's effect, the used 5V supply voltage as reference power supply voltage or outer power voltage must force down 3.3V now.
But,, just require to obtain internal power source voltage with a kind of power supply piezoelectric voltage control circuit that reduces outer power voltage in the interstage that changes because the voltage level change of system takes slow 2 to 3 years compared with the memory chip area change.
Consult Fig. 1 of source voltage control circuit of a kind of routine of expression, this operation circuit comprises and has external voltage input end V respectively
1And V
2The input end with the output that receives first and second differential amplifiers 20 and 30 and be connected to this first and first output terminal of the other input end of the mat woven of fine bamboo strips two differential amplifiers 20 and 30, also comprise the 3rd differential amplifier 50 of positive input terminal with first output node 47 that is connected to feedback circuit 40 and the negative input end that is connected its output terminal 51.
The mat woven of fine bamboo strips one and second differential amplifier 20,30 comprise its grid respectively with voltage input end V
1, V
2The mat woven of fine bamboo strips one nmos pass transistor 23,34 that links to each other, its grid is connected to second nmos pass transistor 24 of second output node 48 of feedback circuit 40 jointly, 33, independently current source 25,35 is connected between the source electrode and ground voltage terminal of the mat woven of fine bamboo strips one and second nmos pass transistor 23 and 24,33 and 34 separately, and the first and second PMOS transistors 21 and 22,31 and 32 are connected on the output node 26,36 between outer power voltage end and the mat woven of fine bamboo strips one PMOS transistor 21,32 and first nmos pass transistor 23,34.
The 3rd differential amplifier 50 receives reference voltage Vref through positive input terminal from feedback circuit 40, thereby produces the internal power source voltage that equals reference voltage Vref.
Fig. 2 is according to the source voltage control circuit of routine, and supply voltage is with respect to the curve of outer power voltage in the expression.
Horizontal axis is represented outer power voltage, and vertical axis is then represented internal power source voltage.Expression is according to the variation respective inner supply voltage " c " of two input voltage a and b among the figure.For convenience of explanation, external power voltage is divided into three intervals, promptly comprises 3.3 volts of first following intervals 60, from 3.3 volts to 6.6 volts second interval the 3rd interval 62 more than 61 and 6.6 volts.
The work of conventional source voltage control circuit is illustrated in conjunction with Fig. 1 and Fig. 2 now.
First and second differential amplifiers 20 and 30 receive the outside voltage V that applies by the grid of first nmos pass transistor 23,34 respectively
1And V
2And the grid that passes through second nmos pass transistor 24,33 receives the voltage by first and second resistance, 45,46 dividing potential drops
。Thereby the voltage that one of nmos pass transistor receives is higher, just more conducting, the output that produces " low " level or " height " level state on output node 26,36.
Control the electric current handling capacity of the third and fourth PMOS transistor 41,42 in the output at output node 26,36 places, so that produce the reference voltage Vref of a requirement at first output node, 47 places.
When external power voltage is to be lower than in 3.3 volts first interval 60 an input voltage V of the mat woven of fine bamboo strips one differential amplifier 20
1Be an input voltage V greater than second differential amplifier 30
2, as shown in Figure 2.Therefore, up to another input voltage
Become and equal input voltage V
1, first nmos pass transistor 23 of first differential amplifier 20 is with regard to conducting, so that the 3rd PMOS transistor 41 of conducting feedback circuit 40.So, just increase pro rata by additional power source voltage from the reference voltage Vref of first output node 47.
Simultaneously, when external power voltage be 3.3 volts to 6.6 volts second interval 61 in the time, an input voltage V of first differential amplifier 20
1An input voltage V greater than second differential amplifier 30
2Therefore, up to another input terminal voltages of first and second differential amplifiers 20,30
Become an input voltage V who equals the mat woven of fine bamboo strips one differential amplifier 20
1, first differential amplifier works on.So reference voltage Vref equals (R
1+ R
2/ R
2) V
1At this moment, because voltage V
1Be constant, reference voltage Vref has a constant value and irrelevant with the increase of external power voltage with regard to becoming.Like this, to have one be 3.3 volts constant value for interior supply voltage Int Vcc.
When external power voltage is when surpassing in 6.6 volts the 3rd interval 62, an input voltage V of second differential amplifier 30
2Become an input voltage V greater than first differential amplifier 20
1Therefore, up to another input voltages of first and second differential amplifiers 20,30
Become an input voltage V who equals second differential amplifier 30
2, the mat woven of fine bamboo strips two differential amplifiers 30 work on as main differential amplifier.At this moment, reference voltage Vref is with an invariable slope and V
2Pro rata with respect to V
2And increase.
When external voltage surpasses a certain ratings (6.6V) and depends on the restriction of the internal power source voltage of the whole characteristic of semiconductor memory device, the increase of internal power source voltage is very main for the reliability of semiconductor devices.Therefore, the slope of interior supply voltage outside should be able to be quick during the supply voltage overrate must be to adjusting.
But, must change two input voltage V of the mat woven of fine bamboo strips one and the mat woven of fine bamboo strips two differential amplifiers 20 and 30 for slope according to supply voltage in the source voltage control circuit adjustment of routine
1And V
2And the mat woven of fine bamboo strips one of feedback circuit 40 and second resistance 45 and 46, to cause difficulty thus.
In addition, between standby period, are first and the mat woven of fine bamboo strips two resistance 45 and 46 and by feedback circuit 40 by the input voltage V of first and second differential amplifiers 20 and 30 by 10 consumed current of conventional source voltage control circuit reference voltage generating circuit
1With by V
2The electric current summation that causes.Therefore, though should make the standby current sinking of semiconductor storage unit keep very little value, however but become very greatly, and this is because conventional reference voltage generating circuit itself comprises due to the differential amplifier.
One object of the present invention is, provides a kind of source voltage control circuit to come the slope of supply voltage in the rapid adjustment during supply voltage overrate outside.
Another object of the present invention is to, provide a kind of source voltage control circuit to make standby current sinking reduce to minimum value.
According to the present invention, a kind of source voltage control circuit comprises:
A reference voltage generating circuit that is connected with the outer power voltage end with its negative-feedback circuit;
The mains voltage level testing circuit that is connected with the external power voltage end, supply voltage in being used for outside increasing when supply voltage is equal to or greater than a certain given voltage;
The mat woven of fine bamboo strips one differential amplifier circuit with two input ends, its input signal comprises the output of reference voltage generating circuit and the interior supply voltage of being controlled by one first control signal and mains voltage level testing circuit, and the output of the mat woven of fine bamboo strips one differential amplifier circuit is connected with an external power voltage end; Also have
One second differential amplifier circuit has two inputs, and above-mentioned input comprises the output of reference voltage generating circuit and the interior supply voltage of being controlled by one second control signal, and the output of second differential amplifier circuit is connected with interior power voltage terminal.
Now in conjunction with only the present invention more specifically being described as the accompanying drawing of an embodiment.
For understanding the present invention better and illustrating how can implement the present invention, provide embodiment and accompanying drawing to illustrate now, wherein:
Fig. 1: the circuit diagram of representing a kind of routine.
Fig. 2: expression is used to illustrate according to the reference voltage of Fig. 1 curve map with respect to external power voltage.
Fig. 3: represent circuit diagram of the present invention.
Fig. 4: expression is used to illustrate according to the curve map of supply voltage in of the present invention with respect to external power voltage.
Fig. 5: expression is according to timing diagram of the present invention.
Fig. 6: expression one embodiment of the present of invention.
Illustrate by a kind of source voltage control circuit of the present invention that with reference to Fig. 3 wherein expression has a reference voltage generating circuit 70,90, one first differential amplifier circuits 110 of mains voltage level testing circuit and one second differential amplifier circuit 130.This mat woven of fine bamboo strips one differential amplifier circuit 110 receives two inputs, and above-mentioned input comprises the output voltage V ref and the interior supply voltage Int Vcc of reference voltage generating circuit 70, and above-mentioned input is controlled by one first control signal 125 and mains voltage level testing circuit 90.The output of first differential amplifier circuit 110 is to be connected with an interior power voltage terminal 122.Second differential amplifier circuit 130 receives two inputs, and above-mentioned input comprises the output voltage and the interior supply voltage of reference voltage generating circuit 70, and above-mentioned input is controlled by one second control signal 145.The output of second differential amplifier circuit is to be connected with interior power voltage terminal 122.
Reference voltage generating circuit 70 comprises a plurality of transistors.The current path of the mat woven of fine bamboo strips one nmos pass transistor 73 and the mat woven of fine bamboo strips one PMOS transistor 74 all is connected between external power voltage end and the Control Node 71.A resistance 80 in parallel and second connects into the PMOS transistor 81 of diode between Control Node 71 and ground voltage terminal.Provide a current path that drives PMOS transistor 75 to be connected between external power voltage end and the output node 72, its grid then is connected with Control Node 71.Also being provided with the PMOS transistor 76-79 that a plurality of mat woven of fine bamboo strips three to the 6th connect into diode is connected in series between output node 72 and the ground voltage terminal.The grid that the grid of first nmos pass transistor 73 is connected to output node 72, the one PMOS transistors 74 then is connected to Control Node 71.
Reference voltage generating circuit 70 is always according to Control Node 71 voltages constant reference voltage Vref of drain voltage generation by controlling and driving PMOS transistor 75.Output node 72 is connected to the grid of first nmos pass transistor 73, so that feedback reference voltage Vref.Therefore, the voltage of Control Node 71 is to control according to the variation of reference voltage, because isoparametric variation causes such as temperature, the electric current handling capacity that drives PMOS transistor 75 so just can be regulated equally in above-mentioned variation.
Driving PMOS transistor 75 is used for output node 72 chargings.The 2nd PMOS transistor 81 disconnects transistor as one, and its grid is connected to ground voltage terminal.Therefore, when external power voltage surpasses the mat woven of fine bamboo strips one nmos pass transistor 73 and first and the threshold voltage of the mat woven of fine bamboo strips two PMOS transistors 74 and 81, the 2nd PMOS transistor 81 is switched on, and has the characteristic of a resistance.
Mains voltage level testing circuit 90 comprises first group of nmos pass transistor 92-96 that connects into diode that is connected between external power voltage end and the detection node 91.Resistance 102 is connected between detection node 91 and the ground voltage terminal.Two groups of nmos pass transistor 97,98 and detection node 91 that connect into diode of the mat woven of fine bamboo strips are in series.Second nmos pass transistor 99 also is provided, and its current path is connected nmos pass transistor 98 and ground voltage terminal, and its grid then is connected with the first control signal end 125.The 3rd nmos pass transistor 100 has grid and the drain electrode that is connected with detection node 91.The 4th nmos pass transistor 101 has the source electrode that is connected the 3rd nmos pass transistor 100 and the current path of ground voltage terminal, and grid then is connected with the first control signal end 125.
First group of nmos pass transistor 92-96 that connects into diode is used to detect the external power voltage level, so that by reducing external power voltage with the proportional threshold voltage of the number of nmos pass transistor.The external power voltage that reduces is applied on the detection node 91.
The mat woven of fine bamboo strips one differential amplifier circuit 110 comprises the first single-ended N raceway groove input difference amplifier (Single-euded N Channel input differentialamplifier) 105, and this amplifier comprises the 7th and the 8th PMOS transistor 113 and the 114 and the 5th to the 7th nmos pass transistor 115,116 and 117.Also be provided with the 9th PMOS transistor 120, its current path is connected between the output node 111 and external power voltage end of first differential amplifier 105, and its grid then is connected with the first control signal end 125.The the 8th and the 9th NNOS transistor 118 and 119 is connected in series between output node 111 and the ground voltage terminal, and its grid is connected with the first control signal end 125 with the detection node 91 of mains voltage level testing circuit 90 respectively.The grid of the tenth PMOS transistor 121 is connected with output node 111, and its current path then is connected between external power voltage end and the interior power voltage terminal 122.
Gate feed first control signal 125 of the 7th nmos pass transistor 117.Two input ends of first differential amplifier 105 are the grids and the grid that is connected to the 6th nmos pass transistor 116 of internal power source voltage end 122 that are connected to the 5th nmos pass transistor 115 of reference voltage generation electrical equipment 70 output nodes 72.
Second differential amplifier 130 comprises one second single-ended N raceway groove input difference amplifier (Single-eneded N-Channel input differentialamplifier) 138, and this amplifier comprises the 11 and the mat woven of fine bamboo strips ten bi-NMOS transistors 132 and 133 and the mat woven of fine bamboo strips ten to the tenth bi-NMOS transistors 135,136 and 137.Also be provided with the 13 nmos pass transistor 139, its current channel is connected between the output node 131 of the external power voltage end and second differential amplifier 138, and its grid then is connected with the second control signal end 145.The 13 PMOS transistor 140 also is provided with the current path that is connected between external power voltage end and the interior power voltage terminal 122, and its grid then is connected with output node 131.
Second differential amplifier 138 has two input ends, and above-mentioned input end comprises the grid of the tenth nmos pass transistor 135 that is connected with the output node 72 of reference voltage generating circuit 70 and the grid of the 11 N raceway groove MOS (metal-oxide-semiconductor) transistor 136 that links to each other with internal power source voltage end 122.The grid of the grid of the tenth bi-NMOS transistor 137 and the tenth nmos pass transistor 135 jointly links to each other with the output node 72 of reference voltage generating circuit 70.
With reference to Fig. 4, show the change curve of a description references voltage to additional power source voltage.Horizontal coordinate is represented external power voltage, and vertical coordinate is then represented interior supply voltage.Reference letter a, b, c represent to have the interior supply voltage of Different Slope, and d then represents standby interior supply voltage, and this voltage is the reference voltage of reference voltage generator circuit simultaneously.
With reference to a special 7V value of desired 3.3V magnitude of voltage and external voltage, external power voltage is divided into three intervals, and wherein first interval 150 is below 3.3 volts, and second interval 151 is from 3.3 volts to 7 volts, and the 3rd interval 152 then is more than 7 volts.
In Fig. 5, A represents the timing diagram of outer chip select signal, and B represents the timing diagram to added first control signal of first differential amplifier circuit, and C then represents the timing diagram to added second control signal of second differential amplifier circuit.
When outer chip select signal A is during at " low level " state, the first control signal B becomes " high level " state, so that start first differential amplifier circuit 110, so source voltage control circuit enters the work period 155.Otherwise when outer chip select signal A is at " high " state, the second control signal C just becomes " low level " state, so that start second differential amplifier circuit 130, so source voltage control circuit just enters back-up period 156.
Describe the work of circuit of the present invention in detail referring now to Fig. 3,4 and 5.
When external power voltage is in first interval 150,, drive of resistance 80 dead grounds of the grid of PMOS transistor 75 by reference voltage generating circuit 40 promptly less than 3.3 volts of required values.Thereby, driving just conducting fully of PMOS transistor 75, the reference voltage Vref of output node 72 just depends on the external power voltage vcc like this.
If external power voltage increases gradually and enters second interval 151, the grid voltage that drives PMOS transistor 75 increases with regard to the electric current owing to flow through resistance 80 and the 2nd PMOS transistor 81.Therefore, the electric current handling capacity that drives PMOS transistor 75 just descends, and the reference voltage Vref of output node 72 just keeps 3.3 volts of steady state values like this, and irrelevant with the increase of external voltage.
In other words, when external power voltage is increased to 3.3 volts when above, the electric current handling capacity that drives PMOS transistor 75 just correspondingly descends, so the reference voltage Vref of output node 72 just keeps 3.3 volts of steady state values as shown in Fig. 4 (d).
Otherwise, if reference voltage Vref changes owing to temperature or other parameters, this variation just feeds back on the grid of first nmos pass transistor 73 from output node 72, and arrive by a PMOS transistor 74 negative feedbacks again and drive PMOS transistor 75, reduce to minimum with regard to the variation that makes reference voltage Vref like this.
In other words, when reference voltage increase to surpass required value, the high voltage that is added on the grid of first nmos pass transistor 73 will make the mat woven of fine bamboo strips one more conducting of nmos pass transistor 73.Thereby the voltage that is added to Control Node 71 increases, so that reduce the electric current handling capacity that drives PMOS transistor 75, the reference voltage of output node 72 just keeps a steady state value like this.
Equally, identical principle of work also is applicable to the situation that is reduced to or is lower than required value when reference voltage.The constant reference voltage of output node 72 is used as first input voltage of first and second differential amplifier circuits 110,130, and in the work period, first control signal 125 makes the mat woven of fine bamboo strips one differential amplifier circuit 110 to work at " high level " state.In back-up period, second control signal 145 makes the mat woven of fine bamboo strips two differential amplifier circuits 130 to work at " low level " state.
In the work period, when first control signal 125 enters " high " state, the 7th nmos pass transistor 117 of first differential amplifier 105 is switched on, so that start the mat woven of fine bamboo strips one differential amplifier 105.Otherwise, the 9th PMOS transistor 120 by first control signal 125 in the conducting of " high level " state, so that conducting first differential amplifier circuit 110.
If external power voltage is in first interval 150 of Fig. 4, the 5th nmos pass transistor 115 of the mat woven of fine bamboo strips one differential amplifier 105 and the increase more and more conducting pro rata of the reference voltage of output node 72.Therefore, the voltage level of the output node 111 of first differential amplifier 105 just reduces gradually, so that increase the electric current handling capacity of the tenth PMOS transistor 121, so just obtain and be applied to the proportional builtin voltage of external power voltage on the source electrode of the tenth PMOS transistor 121.
In addition, if external power voltage is in second interval 151 of Fig. 4, constant reference voltage is added on the grid of the 5th nmos pass transistor 115 of the mat woven of fine bamboo strips one differential amplifier 105, thereby flow through the 5th and the 6th nmos pass transistor 115 and 116 electric currents keep constant.So constant voltage is added on the grid of the tenth PMOS transistor 121, so even external power voltage increases, voltage was stable in constant electric current handling capacity made.
Though semiconductor storage unit should keep a stable interior supply voltage in normal mode, and it is irrelevant with the external power change in voltage, still being necessary increases interior supply voltage, so that test the reliability of this semiconductor devices greater than the ratings of external power voltage the time.
In the present embodiment, when external power voltage surpassed 7 volts, supply voltage increased in just causing.When external power voltage surpasses 7 volts is in the 3rd interval 152 time, and the voltage of the detection node 91 of mains voltage level testing circuit 90 has a value, is enough to the 8th nmos pass transistor 118 that conducting is connected with detection node 91.
Therefore, the electric current of output node 111 of first differential amplifier 105 that flows into the 5th NNOS transistor 115 is the same with the electric current of the 8th and the 9th nmos pass transistor 118 and 119, so that the tenth more and more conducting of PMOS transistor 121 that its grid is linked to each other with output node 111, thereby interior voltage end 122 has the linear supply voltage that increases.
Simultaneously, if utilize the light characteristic (light of the characteristic) of a plurality of semiconductor memory chips to adjust to such an extent that be higher than the ratings of external voltage the slope of interior voltage, only need to change the size of the 8th nmos pass transistor 118, this transistorized electric current handling capacity depends on the voltage of detection node 91, compares with the common power voltage control circuit thus just to be easier to adjust.
In second differential amplifier circuit 130, forbid that second control signal 145 enters " high " state and makes 139 conductings of the 13 nmos pass transistor.Therefore, the output node 131 of second differential amplifier 138 is just easily by Vcc-V
TN(V freely charges
TNBe the threshold voltage of nmos pass transistor), like this, the 13 PMOS transistor 140 just keeps turn-offing.So, prevented to feed back to second differential amplifier circuit 130 by the 13 PMOS transistor 140 by the interior supply voltage that first differential amplifier circuit 110 produces.Here, second differential amplifier circuit 130 has that to compare with the mat woven of fine bamboo strips one differential amplifier circuit 110 be very little size, so that make standby current sinking reduce to minimum, thereby has the very slow response speed of several microseconds that only is.
If interior supply voltage is owing to certain factor increases, the 6th nmos pass transistor 116 of first differential amplifier circuit 110 is switched on, and therefore, the output of output node 111 just becomes " high " state.So the tenth PMOS transistor 121 is turned off, thereby supply voltage continues to increase in preventing.
During this period, second differential amplifier circuit 130 needs certain time delay of complete conducting, because the response speed of the 11 nmos pass transistor 136 is slow.At this moment, if there is not the 13 nmos pass transistor 139, the output of output node 131 just keeps " low " state in time delay, so that conducting the 13 PMOS transistor 140.Therefore, contingent phenomenon is that interior supply voltage increases according to the increase of external power voltage.
But circuit of the present invention is introduced the mat woven of fine bamboo strips 13 nmos pass transistors that will give conducting and remove to turn-off the mat woven of fine bamboo strips 13 PMOS transistors 140 during valid function.Therefore, having only first differential amplifier circuit 110 is work in the same period of working.
Then, in the back-up period of source voltage control circuit, chip selects second control signal 145 of impact damper to change to " low " state from " high " state, thereby the 13 nmos pass transistor 139 of second differential amplifier circuit 130 is turn-offed.So, when external power voltage be the work period second interval in the time, second differential amplifier circuit becomes and has the structure identical with first differential amplifier circuit 110, thus according to stable interior voltage of same principle of work maintenance.And even 7 volts of external power voltage overrates, the electric current handling capacity of the 13 PMOS transistor 140 always remains unchanged, and passes through circuit because be provided with other electric current such as the 8th nmos pass transistor 118 of first differential amplifier circuit 110.Therefore, even external power voltage continues to be increased to greater than ratings, interior voltage still remains on 3.3 volts of the burning voltages.
Simultaneously, in first differential amplifier circuit 110, select first control signal 125 of impact damper when chip and be prohibited from entering " low " state, the mat woven of fine bamboo strips nine PMOS transistors 120 just are switched on.So the external power voltage vcc just directly is added on the grid of the tenth PMOS transistor 121, thereby turn-off the mat woven of fine bamboo strips one differential amplifier circuit 110.
In addition, as shown in Figure 5,156, the first control signal A directly enter into " high " state from " low " state from the work period 155 to back-up period, and still, the second control signal B enters " low " state from " high " state through given Td time delay.Therefore, even when all signals all are under an embargo in semiconductor storage unit, first differential amplifier circuit 110 time delay Td operate more so that prevent in voltage reduce because of current sinking.Thereby make it not only in back-up period, and be in all stable work of work period.
With reference to Fig. 6 a block scheme has been shown, has been used for explanation according to reference voltage generating circuit of the present invention and the mat woven of fine bamboo strips one and second differential amplifier circuit.Be used to illustrate identical parts with identical reference number shown in Figure 3.First and second differential amplifier circuits are respectively applied for work and standby work.
First, second, third differential amplifier circuit 110,150,160 is set is used for effective work, a differential amplifier circuit 130 also is set is used for standby operation, each circuit is connected between the output node 72 and interior power voltage terminal 122,231,241 of reference voltage generating circuit 70.The current path of the one PMOS transistor 251 is arranged on interior power voltage terminal 122,231 and is connected between the grid of first control signal, 125 ends.In the current path of the 2nd PMOS transistor 252 is located between power voltage terminal 231,241 and the grid that is connected first control signal 125.
The output terminal that is used for the difference amplification appliance 130 of standby operation is connected to the interior power voltage terminal 122 of first differential amplifier circuit 110 that is used for valid function.
In the memory device of a routine, in order to prevent noise and improve reliability that advised a kind of source voltage control circuit, wherein differential amplifier separates according to power lead in each.But the problem of this circuit is to cause so big standby current and so many standby differential amplifier.
In the present invention, in order to prevent from noise and improve reliability, used to be connected to the mat woven of fine bamboo strips one and the 2nd PMOS transistor 251 and 252 that grid links to each other with first control signal, 125 ends of chip selection impact damper that have on each interior power lead.
Therefore, in the valid function cycle, the mat woven of fine bamboo strips one and the 2nd PMOS transistor 251 and 252 turn-off by first control signal 125 of " high " state, and power lead separates each other in each like this.In the standby operation cycle, when first control signal 125 is changed when entering " low " state and coming the conducting first and second PMOS transistors 251 and 252, thereby connect in each power lead together.Like this, the valid function cycle in each power supply be separated each other, prevent noise and improve reliability, and the standby operation cycle in each power supply interconnect, then make standby current reduce to minimum.
As mentioned above, source voltage control circuit according to invention is connected to the nmos pass transistor 118 that its grid is connected to the detection node 91 of mains voltage level testing circuit 90 on the output node 111 with first differential amplifier 110 that receives reference voltage Vref, so that when the external power voltage that is applied surpasses a certain ratings, the electric current handling capacity of this nmos pass transistor is increased, thereby power source voltage increase linearly in making.
So, for the slope of interior supply voltage being transferred to slope greater than specified external power voltage, just need to change the input voltage and first and second resistance of two differential amplifiers in custom circuit, but circuit of the present invention only need be adjusted the size of nmos pass transistor.Therefore, just can adjust the slope of interior voltage at an easy rate.
And, conventional source voltage control circuit needs reference voltage generating circuit to comprise the differential amplifier of a high-current consumption, but reference voltage generating circuit of the present invention is provided with differential amplifier, has a constant voltage and always make, thereby reduces standby current sinking greatly.
In addition, circuit of the present invention to reference voltage generating circuit, reduces to minimum thereby make because the reference voltage that temperature or other parameters form changes with the reference voltage negative feedback.
In addition, according to of the present invention in each power lead connect by the PMOS transistor, therefore in power lead just can be separated from each other in the valid function cycle, then be all to link together in the standby operation cycle.So just prevented semi-conductive noise, improved reliability, and made standby current reduce to minimum.
Foregoing description has only illustrated a preferred embodiment of the present invention, is not departing from the scope of the present invention under the situation, and the professional in present technique field can make various remodeling, and the present invention is only limited by appending claims.
Claims (25)
1. a source voltage control circuit comprises:
Be connected to the reference voltage generating means (70) that is used for producing a constant reference voltage on the outer power voltage end;
The mains voltage level pick-up unit (90) that connects described external power voltage end when described external power voltage is equal to or greater than a given voltage, is used for voltage in linear the increasing;
Have two first differential amplifying devices (110) that receive the input end of described reference voltage generating means (70) and described interior supply voltage (122) output respectively, described interior supply voltage (122) is controlled by first control signal (125) and described mains voltage level pick-up unit (90); With
Have two second differential amplifying devices (130) that receive the input end of described reference voltage generating means (70) and described interior supply voltage (122) output, supply voltage (122) is controlled by second control signal (145) in this;
Each PMOS power transistor (121,140) conduction and cut-off independently in described first and second differential amplifying devices (110,130), thus unnecessary current drain reduced during greater than given voltage at described external power voltage.
2. by the source voltage control circuit of claim 1, it is characterized in that described reference voltage generating means (70) comprises:
Be connected in series in first nmos pass transistor (73) between above-mentioned external power voltage and the Control Node (71) and connect into the PMOS transistor (74) of diode;
Be connected in resistance (80) and towing PMOS transistor (81) between above-mentioned Control Node (71) and the ground voltage end in parallel;
Be connected to the output node (72) of above-mentioned first nmos pass transistor (73);
One drives PMOS transistor (75), and its current path is connected between above-mentioned external power voltage end and the above-mentioned output node (72), and its grid is connected above-mentioned Control Node (71).
3. press the source voltage control circuit of claim 2, it is characterized in that, described reference voltage generating means (70) also comprises a current path device, and this current path device comprises a plurality of PMOS transistors (76-79) that connect into diode that are connected between described output node (72) and the ground voltage terminal.
4. by the source voltage control circuit of claim 1, it is characterized in that described mains voltage level pick-up unit (90) comprises:
Be connected in series in the voltage drop device between described external power voltage end and the detection node (91);
Be connected the resistance (102) between described detection node (91) and the ground voltage terminal;
Be connected in series in the nmos pass transistor that connects into diode (97,98) of described detection node (91);
Its current path is connected between above-mentioned transistor (98) and the earth terminal, and its grid is connected to second nmos pass transistor (99) of the above-mentioned first control signal end (125);
Be connected to the nmos pass transistor (100) that the 3rd on the described detection node (91) connects into diode;
Its current path is connected between the source electrode and earth terminal of above-mentioned the 3rd nmos pass transistor (100), and its grid is connected the 4th nmos pass transistor (101) of the above-mentioned first control signal end (125).
5. by the source voltage control circuit of claim 1, it is characterized in that described first differential amplifying device (110) comprises:
Have two output nodes (72) that receive above-mentioned reference voltage generating meanss (70) voltage and above-mentioned in the first single-ended N raceway groove input difference amplifier (105) of input end of supply voltage;
Has the 5th PMOS transistor (120) that the current path that is connected between described dispatch from foreign news agency pressure side and described first differential amplifier (105) output node (111) and grid are connected to the described first control signal end (125);
Have current path that is connected in series between described output node (111) and the ground voltage terminal and the 8th and the 9th nmos pass transistor (118,119) that is connected respectively to the grid of described detection node (91) and the described first control signal end (125);
Has the 6th PMOS transistor (121) that is connected the current path between described external power voltage end and the described interior power voltage terminal (122) and is connected to the grid of described output node (111).
6. by the source voltage control circuit of claim 5, it is characterized in that described first differential amplifier (105) is controlled by described first control signal.
7. by the source voltage control circuit of claim 1, it is characterized in that described this second differential amplifying device (130) comprises:
The second single-ended N raceway groove input difference amplifier (138), two inputs of this amplifier receive the voltage and the described interior supply voltage of described reference voltage generating means (70) output node (72);
The 13 nmos pass transistor (139), this transistor have the current path between the output node (131) that is connected described external power voltage end and described second differential amplifier (138) and are connected to the grid of the above-mentioned second control signal end; With
The 9th PMOS transistor (140), this transistor have the grid that connects described output node (131) and be connected described external power voltage end and interior power voltage terminal (122) between current path.
8. by the source voltage control circuit of claim 7, it is characterized in that described second differential amplifier (138) is to be controlled by the output of described reference voltage generating means (70).
9. press the source voltage control circuit of claim 1, it is characterized in that, described first differential amplifying device (110) is started by described first control signal (125) " high level " state, so that execution valid function, described second differential amplifying device (130) is then started by described second control signal (145) " low level " state, so that carry out standby operation.
10. by the source voltage control circuit of claim 9, it is characterized in that described source voltage control circuit becomes standby mode from working method after described first control signal is through a given time delay.
11. a source voltage control circuit comprises:
Reference voltage generating means (70), it contains:
Output node (72);
First differential amplifying device (110), it contains:
The first single-ended N raceway groove input difference amplifier (105), this amplifier have two and receive the reference voltage of described output node (72) and the input end of interior supply voltage;
Output node (111);
Driving transistors (121), its current path be connected described external power voltage end and described between the power voltage terminal (122), its grid connect described output node (111) and
Second differential amplifying device (130), it contains:
The second single-ended N raceway groove input difference amplifier (138), this amplifier have two input ends that receive described reference voltage and described interior supply voltage,
Output node (131);
Driving transistors (140), its grid are connected to described output node (131), and its current path is connected between described external power voltage end and the described interior power voltage terminal (122);
It is characterized in that described voltage generation circuit (70) also contains:
First nmos pass transistor (73) and connect into the PMOS transistor (74) of diode, the current path of the two is connected in series between external power voltage end and the ground voltage terminal; With drive PMOS transistor (75), its current path is connected that its grid is connected on the grid of described PMOS transistor (74) between described external power voltage end and the output node (72);
Described first differential amplifying device (110) also contains: PMOS transistor (120), and it has current path and the grid that is connected with the first control signal end between the output node (111) that is connected described external power voltage end and described first differential amplifier (105); With the first and second current path transistors (118,119), they have the current path that is connected in series between described output node (111) and the described ground voltage terminal and link to each other with the above-mentioned first control signal end with the outer power voltage that has reduced a set-point respectively with its grid; And
Described second differential amplifying device (130) also contains:
Nmos pass transistor (139), this transistorized current path are connected between described external power voltage end and the described second differential amplifier output node (131), and its grid is connected to the second control signal end.
12. the source voltage control circuit by claim 11 is characterized in that described reference voltage generating means (70) also comprises:
Be connected in above-mentioned drain electrode and resistance (80) between the above-mentioned ground voltage end and the towing PMOS transistor (81) that connects into the PMOS transistor (74) of diode in parallel; With
At the above-mentioned output node (72) of above-mentioned reference voltage generating means (70) and the current path device between the above-mentioned ground voltage end.
13. the source voltage control circuit by claim 12 is characterized in that described current path device comprises a plurality of PMOS transistors (76-79) that connect into diode.
14. the source voltage control circuit by claim 11 is characterized in that also comprising one and is connected the grid of the described first current path transistor (118) and the mains voltage level pick-up unit (90) between the described external power voltage end.
15. the source voltage control circuit by claim 14 is characterized in that described mains voltage level pick-up unit (90) comprises:
A plurality of nmos pass transistors (92-96) that connect into diode, they are connected in series between described external power voltage end and the detection node (91);
Be connected the resistance (102) between described detection node (91) and the described ground voltage terminal;
Be connected in series in the nmos pass transistor that connects into diode (97,98) on the described detection node (91);
Its current path is connected between described nmos pass transistor (98) and the described ground voltage terminal, and its grid connects the nmos pass transistor (99) of the described first control signal end (125);
Connect into the nmos pass transistor (100) of diode, be connected in series between described detection node (91) and the described ground voltage terminal; Also have
Its grid is connected to the nmos pass transistor (101) of the above-mentioned first control signal end.
16. the source voltage control circuit by claim 11 is characterized in that the described first and second current path transistors (118,119) are N NMOS N-channel MOS N transistor npn npn.
17. the source voltage control circuit by claim 16 is characterized in that the driving transistors (121,140) of described first and second differential amplifying devices (110,130) is the P-channel metal-oxide-semiconductor transistor npn npn.
18. source voltage control circuit by claim 17, it is characterized in that, when above-mentioned external power voltage was equal to or greater than a certain ratings, the interior voltage slope of power voltage terminal in described (122) was to control by the size of adjusting the described first current path transistor (118).
19. source voltage control circuit by claim 11, it is characterized in that, described first differential amplifying device (110) is started by first control signal (125) " high level " state, so that execution valid function, described second differential amplifying device (130) is then started by described second control signal (145) " low level " state, so that carry out standby operation.
20. the source voltage control circuit by claim 19 is characterized in that described source voltage control circuit changes to standby mode from working method through described first control signal after (125) one given time delays.
21. the source voltage control circuit by claim 20 is characterized in that, when above-mentioned driving transistors (121) was carried out standby operation, above-mentioned first differential amplifying device (110) was under an embargo.
22. the source voltage control circuit by claim 20 is characterized in that, when above-mentioned driving transistors (140) was carried out valid function, above-mentioned second differential amplifying device (130) was under an embargo.
23. a source voltage control circuit comprises:
Reference voltage generating means (70);
A plurality of differential amplifying devices (110,150,160) that are used for valid function, with a differential amplifying device (130) that is used for standby operation, be connected separately between the output node (72) and each respective end of interior supply voltage (122,231,241) of described reference voltage generating means (70); It is characterized in that:
Strobe unit (251,252), this strobe unit have the current path that is connected between each adjacent above-mentioned internal power source voltage end (122,231,241), and the grid of this strobe unit is connected to the first control signal end (125).
24. the source voltage control circuit by claim 23 is characterized in that described strobe unit (251,252) is the PMOS transistor.
25. the source voltage control circuit by claim 24 is characterized in that described strobe unit (251,252) turn-offs, and connects when standby mode when working method.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019900015678A KR930009148B1 (en) | 1990-09-29 | 1990-09-29 | Source voltage control circuit |
| KR15678/90 | 1990-09-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1051438A CN1051438A (en) | 1991-05-15 |
| CN1044412C true CN1044412C (en) | 1999-07-28 |
Family
ID=19304259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90109627A Expired - Lifetime CN1044412C (en) | 1990-09-29 | 1990-12-03 | Source voltage control circuit |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US5077518A (en) |
| JP (1) | JPH07101374B2 (en) |
| KR (1) | KR930009148B1 (en) |
| CN (1) | CN1044412C (en) |
| DE (1) | DE4037206C2 (en) |
| FR (1) | FR2667409B1 (en) |
| GB (1) | GB2248357B (en) |
| HK (1) | HK36197A (en) |
| IT (1) | IT1250783B (en) |
| NL (1) | NL193038C (en) |
| RU (1) | RU1838814C (en) |
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- 1990-11-22 DE DE4037206A patent/DE4037206C2/en not_active Expired - Fee Related
- 1990-11-26 FR FR9014734A patent/FR2667409B1/en not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| FR2667409B1 (en) | 1993-07-16 |
| KR920007339A (en) | 1992-04-28 |
| NL9100497A (en) | 1992-04-16 |
| KR930009148B1 (en) | 1993-09-23 |
| FR2667409A1 (en) | 1992-04-03 |
| GB2248357A (en) | 1992-04-01 |
| JPH04145509A (en) | 1992-05-19 |
| NL193038B (en) | 1998-04-01 |
| DE4037206C2 (en) | 1995-08-10 |
| NL193038C (en) | 1998-08-04 |
| DE4037206A1 (en) | 1992-04-09 |
| GB2248357B (en) | 1994-07-06 |
| ITRM910727A0 (en) | 1991-09-27 |
| US5077518A (en) | 1991-12-31 |
| CN1051438A (en) | 1991-05-15 |
| ITRM910727A1 (en) | 1992-03-30 |
| RU1838814C (en) | 1993-08-30 |
| GB9112078D0 (en) | 1991-07-24 |
| IT1250783B (en) | 1995-04-21 |
| HK36197A (en) | 1997-04-04 |
| JPH07101374B2 (en) | 1995-11-01 |
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